1984: three-year-old season
As the year began, Okabe was faced with a choice. He had also jockeyed Bizen Nishiki the year before, another strong horse who was on a four-race winning streak, but both he and Symboli Rudolf were slated to race against one another in the Yayoi Sho, the Satsuki Sho, and the Tokyo Yushun. There was a good deal of media attention given to this choice, and it was thought for a time that Okabe would choose Bizen Nishiki. However, he instead chose Symboli Rudolf, commenting that it wasn't even a choice at all. This choice was later proven to be the correct one.
Symboli Rudolf's first race in his 1984 three-year-old season was the G2 Yayoi Sho. Bizen Nishiki was the number-one favorite, but Symboli Rudolf defeated him by 1 1/4 lengths.
After recovering from a minor injury, the horse underwent harsher training to make up for it. He would race Bizen Nishiki again in the G1 Satsuki Sho, the first leg of the Japanese Triple Crown; the two were considered the two main racers, but Symboli Rudolf was the number-one favorite this time. After keeping a third-place position throughout the race, he moved into the lead on the fourth corner. The final stretch turned into a one-on-one between him and Bizen Nishiki on the outside, and the two horses knocked into each other at one point before Symboli Rudolf won by 1 1/4 lengths and setting a race record, earning his first crown. The oblique motion that led to the collision on the track saw Okabe prohibited from jockeying for the next two days. At the award ceremony, Okabe held one finger up in the air, anticipating two more crowns. (Yutaka Take, who jockeyed Deep Impact, would later imitate that performance.)
The 1984 Tokyo Yushun (Japanese Derby) was nicknamed the "SB Derby," indicating the fierce rivalry between Symboli Rudolf and Bizen Nishiki. Symboli Rudolf was overwhelmingly the favorite, however, with 1.3 odds. Several other racehorses pulled out of the race, leading to a field of 21 horses, which was the lowest it had ever been at the time. The track was in poor condition because of a late-spring cold wave and lingering snowfall, which had deposited dirt on the course, giving an edge to horses that had more power than speed. The race began with Suzu Mach, Fujino Fuun, and Suzu Parade, all strong horses, running in the lead. On the far straightaway, Symboli Rudolf didn't respond to Okabe's signal to spurt, leading to audible confusion in the crowd. But on the stretch, he grabbed his bit in his own teeth, overtaking the three in the lead to win his second crown. Bizen Nishiki ended the race far back in 14th, possibly due to his lightness and focus on speed. Okabe held two fingers up at the awards ceremony.
After the derby, Tomohiro Wada made plans for Rudolf to race overseas, which was reported in newspapers at the time. But after an injury to his left front leg and not meeting quarantine requirements, this plan was announced to be canceled in July.
Recovered from an injury to his right shoulder, Symboli Rudolf went into the autumn season fully refreshed, winning the St Lite Kinen with a record time. From there, he took on the Kikuka Sho, the last of the Triple Crown races. He kept to the middle pack, and while the racers slightly ahead of him formed a wall on the third corner, Rudolf broke out on the final stretch and passed Gold Way to win by 3/4 of a length. He became the first ever horse in JRA racing history to win the Classic Triple Crown while undefeated, as well as the first Classic Triple Crown winner after the introduction of the grading system. At the awards ceremony, Okabe held up three fingers. To date, four other horses have won the Triple Crown, but no others have come from the Kanto region.
After the 3000-meter Kikuka Sho, Symboli Rudolf advanced to the Japan Cup just a week later. The 4th Japan Cup would be the first time two Triple Crown winners would compete against each other, as Mr. C.B. had won the Triple Crown the year before. However, Symboli Rudolf was widely reported to be in bad shape, for example having diarrhea, and his younger age compared to the rest of the field as well as the 1-week gap from his previous race led to him being the number-four favorite, the lowest he would ever be in his career. The first favorite was Mr. C.B., who had just come off a record-breaking win at the Autumn Tenno Sho as an end closer. The second favorite was Bedtime, a British horse who was said to be G1-class despite never being able to run in a G1 race due to being a gelding; the third favorite was the American turf-racer Majesty's Prince, said to be the second coming of John Henry. However, it was Takarazuka Kinen winner Katsuragi Ace, who flew under the radar at number-ten favorite, who would run away with the victory, becoming the first Japanese horse to win the Japan Cup. Symboli Rudolf maintained a good position throughout the race, but came in 3rd place to Bedtime, bringing an end to his 8-win streak.
Coming off of his first loss, Symboli Rudolf would then compete against Mr. C.B. and Katsuragi Ace in the Arima Kinen. While Rudolf was only second-place in the fan vote to Mr. C.B., he was the favorite to win, with 1.7 odds. Okabe devoted himself to learning more about Katsuragi Ace after the upset. Katsuragi Ace attempted to replicate his result in the Japan Cup, running far out in front; Rudolf maintained his position in 2nd place the entire time. On the final stretch, though, they traded places, Rudolf beating Katsuragi Ace by two lengths and achieving record time. Symboli Rudolf became the first JRA horse in history to earn four crowns in his three-year-old season. At the awards ceremony, Okabe held up four fingers. With a record that year of 6 wins and 1 third-place finish, Symboli Rudolf was chosen as the JRA's Horse of the Year.